There may be 2 possiblity one either driver is not downloaded properly or settings or check the settings on the computer by clicking on speaker icon on system tray(next time), I mean to say uncheck all the option in advanced mode and set to high. for further clarification revert back.

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Select Advance under Microphone and check the Do not monitor check-box.

This way, you should be able to keep using the microphone without feedback from any speakers.

Go to the Control Panel, and click on Sounds and Audio Devices.
Under Device volume, click on Advanced.
Under Microphone, check the Mute button. If the "Microphone" section is missing, go to Options -> Properties, and under the Playback section, enable it.

The information in this article applies to the following 3rd party software
MSN Messenger 6.x
MSN Messenger 7.x
Window Live Messenger 8.5

The information in this article applies the following platforms
Windows 98
Windows ME
Windows 2000
Windows XP
Windows Vista
Note: The information in this article is not product specific. For
details regarding camera driver and operating system support please see article 3428Step 1: Getting Started
Before we begin setting up the sound in MSN or Windows Live Messenger, ensure the following is complete:

Connect your camera and verify that it is working properly

If using headphones, verify that your device is connected and functioning

If using speakers, verify that they are functioning properly

If using a headset, verify that both the headphone and microphone are connected and working properly.

Step 2: Executing the audio and video setup procedure within the messenger application
This procedure will allow you to assign an audio input and audio
output device, as well as assigning the video device of your choice to
work with the messenger application. The following example uses Windows
Live Messenger 8.5 however, the same procedure can be used for earlier
versions of MSN Messenger 6.x and above. MSN Messenger users please
skip directly to step 4 below.
Note to Windows Live Messenger users: There
are multiple ways to execute the following steps depending on being
signed in vs signed out of the messenger application, and which version
of Windows Live Messenger is being used. To avoid confusion, please
execute the following steps while signed out. We also recommend
updating to the latest version of Windows Live Messenger.
1. Sign out of your account.
2. Launch the messenger application (make sure you are not signed in to your account).
3. Locate and click the "Help" drop down button towards the top right corner and select "Show the menu bar"
4. Now click the "Tools" option in the menu bar and select the “Audio and Video Setup” option.

5. Click “Next to begin the setup process.

6. In the “Speaker Setup” window, select the output device you would
like to use with the messenger application. This step is specific to
speakers or headphones. If your speakers or headphones are USB devices
and connected to your computer, select the device by using the drop
down menu provided. If your speakers or headphones are connected to
your soundcard, the device listed will be the make or model of your
soundcard device.
You can also set the desired volume level and click “Play Sound” for
an audio sample. Click "Next" once you are comfortable with the your
selected options.

7. In the “Microphone Setup” window, select your desired input device from the drop down menu provided.
This selection will be specific to a microphone connected to your
computer. If your Logitech video camera has a built-in microphone, this
option will be presented as “Logitech Mic” with your camera model name
in parentheses as shown above.
If you have an external USB microphone or headset device connected
to your computer that hosts a microphone, select the devices name or
model number in the drop down menu. If your external microphone or
headset is connected to your soundcard, the device listed will be the
make or model of your soundcard device. Once your device is selected,
adjust the microphone volume level to your preference and click next.Note: The microphone volume level may need to be tested in order
to find a comfortable volume level. As a starting point, try setting
the level midway and adjust when necessary by re-executing this
procedure.

8. In the “Webcam Setup” window, select the video device you would like
to use with messenger application. Once selected, you should see a
display sample in the window provided. You can also click the “Options”
button to make camera specific adjustments. Once completed, click the
“Finish” button to apply your changes.

Once you have completed this process, the messenger
application should now be configured to the correct audio input
(microphone), audio output (speakers or headphones), and video device
(webcam) to use when engaging in an audio and or video conversation.

his article covers how to configure a Logitech camera's audio and video settings to work with Skype 3.6 or above.
Answer
This article applies to the following cameras:
All Logitech USB WebcamsThis article applies to the following platforms:
Windows Vista
Windows XPThis article applies to the following 3rd party application:
Skype™ 3.6 or above

To set up Skype for video please be sure that your Logitech webcam
is connected and working. This can be verifed by launching your
QuickCam software and checking for a video stream withinin the
QuickCapture video window. Once the webcam functionality is verified,
please close the QuickCam application and follow the steps below.

Launch Skype™ and click on "Tools" as shown in the figure below
Fig 1

When you click on "Tools" you will see a drop down list
Fig 2

Click on "Options" at the bottom of the drop-down list
Fig 3

A new screen appears. Click on the left side of the pane under "Video Settings"
Fig 4

Durring video conferencing with MSN
Messenger, I can't hear my friend and he can't hear me. Or I can hear
them but they can't hear me. What's wrong?
Answer
This article applies to the following products:
All Logitech Web Cameras with MSN Messenger SupportThis article applies to the following software:
Windows XPTest the Microphone in Sound Recorder

Click the Record button and speak into the microphone of the
camera. You should see the green line move, indicating the application
is picking up sound.

Click the Stop button.

Click the Play button. If there is no sound at playback, check to make sure the correct device is selected.

Click "Edit," then "Audio Properties."

Make sure Logitech is listed as the Preferred device for "Sound recording."

If the microphone does not work in Sound Recorder, click here for help in determining the problem with the mic.
While using MSN Messenger it is the messenger program, not the
camera software, that negotiates the audio streams between two MSN
Messenger Clients. Although we cannot directly support audio issues in
MSN Messenger, the following steps have been known to resolve and
improve audio issues in MSN Messenger. For further information, please
consult the help documents associated with MSN Messenger.Test Your Networking Router
You can also test to see if your router is causing audio
issues by either physically bypassing your router and connecting
directly to your cable/DSL modem or by setting up your computer as the
DMZ (de-militarized zone). If you are a novice networking user, it is
not recommended that you leave your computer in the DMZ state for
extended period as that may leave your computer vulnerable to attack.
However, you may briefly configure your computer as the DMZ to
determine if your network settings are causing the audio issues. For
DMZ setup instructions, please consult your router's documentation. Enable Universal Plug and Play (UPnP) on both Windows XP and Your Router.
If either of the above steps resolves the no audio problem, try the following steps.

Open Add or Remove Programs in Control Panel. To open Add or Remove Programs, click Start, point to Settings, click ControlPanel, and then double-click Add or Remove Programs.

Click Add/Remove Windows Components.

In the Components list, select the Networking Services check box, and then click Details.

Make sure the Universal Plug and Play box is checked.

Notes: If you used a CD to set up Windows, you will be prompted to insert it into your computer.
If your router does not support UPnP or you still get no audio after
enabling UPnP on both Windows XP and your router, you must manually
open all UDP ports between 5004 and 65535. This is because the audio
streams are sent dynamically using that range of ports. Without a
dynamic way to open those ports like UPnP, there is no way for MSN
Messenger to successfully negotiate the audio stream. Consult your
router's documentation for instructions to manually open these required
ports.
If you are still experiencing audio issues within MSN Messenger, and
you have verified that the microphone is working in Sound Recorder,
contact MSN Messenger Support.

This article covers Accoustic Echo Canncellation (AEC) and how it works.
Answer
This article applies to the following products:
QuickCam 10.x and RightSound supported cameras
QuickCam 11.x and RightSound supported cameras
Call Central and RightSound support audio devicesThis article applies to the following platforms:
Windows® 2000 Professional
Windows® XP Professional
Windows® XP Home
Windows® Media Center Home
Windows® Vista
Accoustic EchoCancellation (AEC)'s purpose is to prevent sounds from
your computer's speakers to be picked up by your microphone. This can
be a significant problem with audio or video calling applications where
the voices or sounds from other parties of the call is being
inadvertently picked up by the microphone and fed back into the call,
creating echo and other sound distortions. Without AEC, this echo can
detract from the quality of a call and in extreme situations, the echo
can degrade the audio experience to the point where the audio is
useless.
To prevent this from happening, the AEC component monitors sounds
being played by your computer's speakers while monitoring the incoming
sound picked up by your computer's microphone. The AEC module takes
the outgoing and incoming sound signals and compares them to determine
if echo is present. If echo is found, it is subtracted before the
audio from the microphone is sent to the requesting application. This
will result in the remote party only hearing you speak, without being
distracted by hearing their own voice echo back to them.
When enabled, echo is eliminated for the recipient of the
audio/video message. For echo free chatting, both parties need to have
a RightSound technology enabled web camera that supports the AEC
feature.

Click the Record button and speak into the microphone of the
camera. You should see the green line move, indicating the application
is picking up sound.

Click the Stop button.

Click the Play button. If there is no sound at playback, check to make sure the correct device is selected.

Click "Edit," then "Audio Properties."

Make sure Logitech is listed as the Preferred device for "Sound recording."

If the microphone does not work in Sound Recorder, click here for help in determining the problem with the mic.
While using MSN Messenger it is the messenger program, not the
camera software, that negotiates the audio streams between two MSN
Messenger Clients. Although we cannot directly support audio issues in
MSN Messenger, the following steps have been known to resolve and
improve audio issues in MSN Messenger. For further information, please
consult the help documents associated with MSN Messenger.Test Your Networking Router
You can also test to see if your router is causing audio
issues by either physically bypassing your router and connecting
directly to your cable/DSL modem or by setting up your computer as the
DMZ (de-militarized zone). If you are a novice networking user, it is
not recommended that you leave your computer in the DMZ state for
extended period as that may leave your computer vulnerable to attack.
However, you may briefly configure your computer as the DMZ to
determine if your network settings are causing the audio issues. For
DMZ setup instructions, please consult your router's documentation. Enable Universal Plug and Play (UPnP) on both Windows XP and Your Router.
If either of the above steps resolves the no audio problem, try the following steps.

Open Add or Remove Programs in Control Panel. To open Add or Remove Programs, click Start, point to Settings, click ControlPanel, and then double-click Add or Remove Programs.

Click Add/Remove Windows Components.

In the Components list, select the Networking Services check box, and then click Details.

Make sure the Universal Plug and Play box is checked.

Notes: If you used a CD to set up Windows, you will be prompted to insert it into your computer.
If your router does not support UPnP or you still get no audio after
enabling UPnP on both Windows XP and your router, you must manually
open all UDP ports between 5004 and 65535. This is because the audio
streams are sent dynamically using that range of ports. Without a
dynamic way to open those ports like UPnP, there is no way for MSN
Messenger to successfully negotiate the audio stream. Consult your
router's documentation for instructions to manually open these required
ports.
If you are still experiencing audio issues within MSN Messenger, and
you have verified that the microphone is working in Sound Recorder,
contact MSN Messenger Support.

Windows XP
Windows Messenger is a native Instant Messenger application to Windows XP. This application can be used to set the output device of your choice. In turn, this information will carry over to the MSN Messenger 7.5 application settings.
Launch Windows Messenger and execute the audio tuning wizard.

Windows XP
Windows Messenger is a native Instant Messenger application to Windows XP. This application can be used to set the output device of your choice. In turn, this information will carry over to the MSN Messenger 7.5 application settings.
Launch Windows Messenger and execute the audio tuning wizard.

You will be required to run an
audio setup wizard through the messenger application in order for MSN
or Windows Live Messenger to recognize sound using a microphone and
produce sound through speakers, headphones, or headsets.
The information in this article will describe the correct procedure
to setup audio and video within the MSN or Windows Live Messenger
application to achieve proper audio functionality.
Answer
The information in this article applies to the following 3rd party software
MSN Messenger 6.x
MSN Messenger 7.x
Window Live Messenger 8.5

The information in this article applies the following platforms
Windows 98
Windows ME
Windows 2000
Windows XP
Windows Vista
Note: The information in this article is not product specific. For
details regarding camera driver and operating system support please see article 3428

Step 1: Getting Started
Before we begin setting up the sound in MSN or Windows Live Messenger, ensure the following is complete:

Connect your camera and verify that it is working properly

If using headphones, verify that your device is connected and functioning

If using speakers, verify that they are functioning properly

If using a headset, verify that both the headphone and microphone are connected and working properly.

Step 2: Executing the audio and video setup procedure within the messenger application
This procedure will allow you to assign an audio input and audio
output device, as well as assigning the video device of your choice to
work with the messenger application. The following example uses Windows
Live Messenger 8.5 however, the same procedure can be used for earlier
versions of MSN Messenger 6.x and above. MSN Messenger users please
skip directly to step 4 below.
Note to Windows Live Messenger users: There
are multiple ways to execute the following steps depending on being
signed in vs signed out of the messenger application, and which version
of Windows Live Messenger is being used. To avoid confusion, please
execute the following steps while signed out. We also recommend
updating to the latest version of Windows Live Messenger.
1. Sign out of your account.
2. Launch the messenger application (make sure you are not signed in to your account).
3. Locate and click the "Help" drop down button towards the top right corner and select "Show the menu bar"
4. Now click the "Tools" option in the menu bar and select the “Audio and Video Setup” option.

5. Click “Next to begin the setup process.

6. In the “Speaker Setup” window, select the output device you would
like to use with the messenger application. This step is specific to
speakers or headphones. If your speakers or headphones are USB devices
and connected to your computer, select the device by using the drop
down menu provided. If your speakers or headphones are connected to
your soundcard, the device listed will be the make or model of your
soundcard device.
You can also set the desired volume level and click “Play Sound” for
an audio sample. Click "Next" once you are comfortable with the your
selected options.

7. In the “Microphone Setup” window, select your desired input device from the drop down menu provided.
This selection will be specific to a microphone connected to your
computer. If your Logitech video camera has a built-in microphone, this
option will be presented as “Logitech Mic” with your camera model name
in parentheses as shown above.
If you have an external USB microphone or headset device connected
to your computer that hosts a microphone, select the devices name or
model number in the drop down menu. If your external microphone or
headset is connected to your soundcard, the device listed will be the
make or model of your soundcard device. Once your device is selected,
adjust the microphone volume level to your preference and click next.Note: The microphone volume level may need to be tested in order
to find a comfortable volume level. As a starting point, try setting
the level midway and adjust when necessary by re-executing this
procedure.

8. In the “Webcam Setup” window, select the video device you would like
to use with messenger application. Once selected, you should see a
display sample in the window provided. You can also click the “Options”
button to make camera specific adjustments. Once completed, click the
“Finish” button to apply your changes.

Once you have completed this process, the messenger
application should now be configured to the correct audio input
(microphone), audio output (speakers or headphones), and video device
(webcam) to use when engaging in an audio and or video conversation.

First, be sure to have the latest software from logitech's website, and the latest MSN.

Then perform the following:

Execute the audio and video setup procedure within MSN Messenger 7.5.
This procedure will allow you to assign an audio input and audio
output device, as well as assign the video device of your choice to
work with MSN Messenger.
1. Launch MSN Messenger and select the “Audio and Vide Setup” option from the “Tools” menu.
Figure 1

2. Click “Next to begin the setup process
Figure 2

3. In the “Speaker Setup” window, select the output device you would like to use with MSN
Messenger. This step is specific to speakers or headphones. If your
speakers or headphone device is connected to your computer, select the
device by using the drop down menu provided. You can also set the
desired volume level and click “Play Sound” for an audio sample. Once
you are comfortable with the your selected options, Click “Next”
Figure 3

4. In the “Microphone Setup” window, select your desired input device
from the drop down menu provided. This selection will be specific to a
microphone connected to your computer. If your Logitech video camera
has a built-in microphone, this option will be presented as “Logitech
Mic” with your camera model name in parentheses as shown below. If you
have an external headset device connected to your computer which hosts
a microphone, select the devices name or model number in the drop down
menu. Once your device is selected, adjust the microphone volume level
to your preference and click next.Note: the microphone volume level may need to be tested in order
to find a comfortable listening level for you contacts. As a starting
point, try setting the level midway and adjust when necessary by
re-executing this procedure.
Figure 4

5. In the “Webcam Setup” window, select the video device you would like to use with MSN
Messenger. Once selected you should see a display sample in the window
provided. You can also click the “Options” button to make camera
specific adjustments. Once completed, click the “Finish” button to
apply your changes.
Figure 5
6. Once you have completed this process, MSN
Messenger should now know the audio input (microphone) audio output
(speakers or headphones) and video device (webcam) to use when engaging
in an audio and or video conversation.

In Vista, right click on the speaker icon in your system tray (usually located at the bottom right of the screen) and select "Recording Devices". Be sure that your microphone is enabled in this list. In Skype and MSN, find the audio hardware setup, and make sure to select your mic-in port into which the mic is plugged.

It may be that this person is "messing around" with you, or their speakers are rigged, from my experince, it sounds like your headset is perfectly fine, or your headset microphone switch was toggled on "Off" Msn is just a instant messaging chat, shouldn't have anything to do with your headset.